type 7 finding sum difference product based ratio & proportion problems Practice Questions Answers Test with Solutions & More Shortcuts

Question : 16 [SSC CHSL 2012]

The total number of students in a school was 660. The ratio between boys and girls was 13 : 9. After some days, 30 girls joined the school and some boys left the school and new ratio between boys and girls became 6 : 5. The number of boys who left the school is :

a) 30

b) 60

c) 40

d) 50

Question : 17 [SSC CPO S.I.2006]

The ratio of the number of ladies to that of gents at a party was 3 : 2. When 20 more gents joined the party, the ratio was reversed. The number of ladies present at the party was

a) 24

b) 16

c) 32

d) 36

Question : 18 [SSC CGL Tier-I 2013]

Three numbers are in the ratio 1 : 2 : 3. By adding 5 to each of them, the new numbers are in the ratio 2 : 3 : 4. The numbers are:

a) 1, 2, 3

b) 5, 10, 15

c) 15, 30, 45

d) 10, 20, 30

Question : 19 [SSC CGL Prelim 2002]

The students in three classes are in the ratio 2 : 3 : 5. If 40 students are increased in each class, the ratio changes to 4 : 5 : 7. Originally, the total number of students was :

a) 200

b) 400

c) 180

d) 100

Question : 20 [SSC CGL Tier-I 2010]

What must be added to each term of the ratio 7 : 11, so as to make it equal to 3 : 4 ?

a) 6.5

b) 5

c) 7.5

d) 8